AACU = Acronyms & Abbreviations Commonly Used

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Many people have asked for it, and many people have answered them. Here is a list of terms used in the RC hobby. I gathered these from too many post to give credit to all the people who helped create this, but you know who you are.
Smash that 'like' button if this helped you!

*Please message me to add any relevant ones I missed.

AC = Aircraft

AGL = Above Ground Level

AMA = Academy of Model Aeronautics

AMSL = Above Mean Sea Level

ARTF = Almost ready to fly

ASL = Above Sea Level

ATTI = Attitude

AUW = All Up Weight

BNF = Bind n Fly (transmitter)

BTU= Blue Tooth Unit

BLOS = Beyond line of sight

BMFA - British Model Flying Association

Cal= Calibration

CA = Collision Avoidance

CAA = Civil Aviation Authority (UK Regulator)

CAAS = Civil Aviation Authority of Singapore (Singapore Regulator)

CL = Course Lock
or
CL - Control Line

CSC combination stick command

DJI = Da-Jiang Innovation

ESC= electronic speed controller

FAA = Federal Aviation Administration (US Regulator)

FF - Free Flight

FPV = first person view

FRZ - Flight Restricted Zone

FS = Failsafe

GHz = Giga-hertz

GPS = Global Positioning System

HL = Home Lock

IR = Internal Resistance

IOC = Intelligent Orientation Control

IMU - Inertial Measurement Unit

LHCP = Left Hand Circular Polarized

LiPo = Lithium-Polymer (battery)

LOS = Line of sight

MC = Main controller

NAS - National Airspace System

NFZ - No Fly Zone

MHz = Mega-hertz

MSL = Mean Sea Level

Nicad = Nickle Cadmium

NOTAM = Notice to Airmen

OA = Obstacle Avoidance

OP = Original Poster

POI = Point of Interest

RC = Remote Control

RHCP = Right Hand Circular Polarized

RTF = Ready to fly

RTH = Return To Home

RTM = Read The Manual

Rx = Receiver

SFOC = Special Flight Operation Certificates

SFRA - Special Flight Rules Area

SOC = State Of Charge

SUA = Small Unmanned Aircraft (What the CAA call what we fly)

SUSA = Small Unmanned Surveillance Aircraft (What the CAA call what we fly)

sUAS = Small unmanned aircraft system (what the FAA calls what we fly)

TCCA = Transport Canada Civil Aviation

TFR = Temporary Flight Restriction

Tx = Transmitter

UAV = Unmanned aerial vehicle

VLOS = Visual line of sight

VRS = Vortex Ring State

VTx - Video Transmitter

VRx - Video Receiver

VPS = Visual Positioning System

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